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renyi1_fixed_sub.m
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renyi1_fixed_sub.m
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% Copyright ©2013. The Regents of the University of California (Regents).
% All Rights Reserved. Permission to use, copy, modify, and distribute
% this software and its documentation for educational, research, and
% not-for-profit purposes, without fee and without a signed licensing
% agreement, is hereby granted, provided that the above copyright notice,
% this paragraph and the following two paragraphs appear in all copies,
% modifications, and distributions. Contact The Office of Technology
% Licensing, UC Berkeley, 2150 Shattuck Avenue, Suite 510, Berkeley, CA
% 94720-1620, (510) 643-7201, for commercial licensing opportunities.
%
% Created by Jonathan T Barron and Jitendra Malik, Electrical Engineering
% and Computer Science, University of California, Berkeley.
%
% IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
% SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
% ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
% REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
%
% REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
% LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
% PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY,
% PROVIDED HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO
% PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
function [V, M] = renyi1_fixed_sub(X, X_splat, sigma, USE_LOG)
K = 1;
X_count = size(X,1);
if USE_LOG == 2
Z = X_count^(2/K);
else
Z = X_count^(2/K) * sqrt(4*pi*sigma^2);
end
N_SIGMAS = 6;
half_width = min(X_splat.n_bins, ceil(N_SIGMAS * sigma / X_splat.bin_width));
blur_kernel = exp(-([-half_width:half_width]'*X_splat.bin_width).^2 / (4*sigma^2))/Z;
N = X_splat.N;
M = convn(N, blur_kernel, 'same');
M = max(eps, M);
V = sum(sum(sum(M .* X_splat.N)));
if USE_LOG
M = -M ./ V;
V = -log(V);
end
M = 2*M;